Fluid-pressure brake



Aug, 21, 1923.

C. C. FARMER FLUID PRESSURE BRAKE Filed Sent. 13, 1922 sERV/CE BRAKES APPLIED DOOR OPE/V RELEASE DOOR CLOSED DOOR CLOSED INVENTOR CLYDE. QFARMER ATTORNEY 'ITEDT s aria 5- PAT-f im CLYDE C. FARMER, F PITTSBURGH, PENNSYLVANIA, ASSIGiNOR- TO I HOUSE AIR BRAKE COMPANY, OF WILIEERDING, PENNSYLVANIA,'A CORPOBATIQN OF PENNSYLVANIA.

FLUID-PRESSURE. BRA E." r. I

ApplicationfiledSeptember 13,1922 Serial 1%. 583,902. Q I I TOaZZ whom it mag concern) V Be it known that. I, CLYDE C. FARMER, a

citizenrof the United States, residing at V Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Fluid-Pressure Brakes, of which the following is a speci- 7 ing 14 having a'cha mber containing a flex ible diaphragm 15. The chamber 16 atone v v rotary valve 12 in this position (and since fication. I,

' This invention relates to an equipment for controlling the'fluid pressurebrakes and the 'car doors and is more particularly'adapted for use in connection with electric traction cars. 1 i

The principal object of my invention is to provide an equipment forcontrolling the brakes and cardoors and having means for maintaining thebrake' cylinder pressure in thecar door open position.

In the accompanying drawing, Fig. l is a diagrammatic view, partly in section, or a car door and brake controlling equipment embodying my invention; Fig; 2 a sectional view of the brake valve device, showingthe rotary valve in service application position with the doors closed; and Fig. 3 a sectional view of the brake valve device, showing the rotary valve in release position with the doors closed.

I As shown in the drawing, the equipment may comprise a brake valve device 1, an emergency valve device 2, a brake cylinder 3, and a main reservoir 4.

The emergency valve device 2 may comprise a casing having a piston chamber 5 connected to an emergency brake pipe 6 and containing piston 7, and a valve cham: her 8, connected by pipe 9 to the main reservoir 4 and containing slide valve 10 adapted to be operated by piston 7. The brake valve devicel may comprise a casing hav ing a valve chamber 11 connected by pipe 9 to the main reservoir 41 and containing a rotary slide valve 12 adapted to be operated by handle 13. r

According to my invention, an additional valve device is provided comprising a cas- 12 and preferably the volume of the pipe 17 is enlarged by including a reservoir 18 therein. The chamber 19 at the opposite side of diaphragm 15 is connected to pipe 20 leading to the brake cylinderB. A valve 21 containedin'valve chamber 22"is provided with a stem 23 adapted toIengage the diaphragm 15' and when'the'valve-21 is opened, connectionis established from "the jmain reseivoird" to the brake cylinder 3, the main reservoir A V bipc 2 1'to the valve chamber .22." I The usual straight air pipe 25 lead's'to the seat of rotary valve 12' and is connected in the release position ofl emergency {slide inder pipe 20 V q p A pipe 27, .connected with the'usual door engine, leadsfto the seat of rotary' 'valve 12 I V g '70 throughpsaidpipe to'ithe door engine,: said & eng ne is operated to opeir th'e -cardoor. Similarly, when' iuid under pressure is supand when fluid-under pressure is supplied plied by the operation" offthe' brake, valve device lt'l rough a pipe 28*to'thefd'oor ens 'gine, the -engine is oper ted-t em the car door. r q

I In operatiomwhen itisdesired to apply the brakes in service, the brake valve hanclle is first turned to shift the'rotary valve 12 to the position shown in Fig. 2.v In this position, fluid under pressure is supplied 7 being connected by l valve 10, throughfcavity brake cyl- V through port 29 in the rotary valve to-fthei straight air pipe 25 and thence flows through I cavity 26 in the emergency slide valve 10 to the brake cylinder 20 and brake cylinder 3. In this position, the brake cylinder pipe 20 is connected through a cavity 30 with pipe 17, so thatthe diaphragm chamber 16 and the-reservoir18 are charged with fluid at the same pressure as supn icd to the brake cylinder. When the deswcd pressure has been obtained in the brake cylinder 3 and it is desiredto open the car door, the brake valve handle is turned to the position shown in Fig. 1. 'In this position, the door closing pipe 28 is connected through cavity 31 with an exhaust port" 32,'while the door opening pipe 27 is connectedv toa port 33, so that fluid under pressure is supplied to the doorengine for operating same to open the car door.

The pipes 17 and 25 are blanked at the V the filllflillndel pressure in diaphragmv chamber 16 is thus bottled up andlreinains at the 'ressure" at which fluid was previously supp ied to the brake. cylinder, if any leak- I h ber 16 will operate diaphragm 15 to open be correspondingly reduced; so that the higherbottled up pressure acting in chamvalve 21 and'thus admit fluid under pressure from the reservoir 4 to the brake cylinder. As soon as the brake cylinder pressure has been restored, the pressures 011 pposite sides or the diaphragm being equal ized, the valve 21"Will close, cutting oi? the further supply of fluid to. the brake cylinder. V v The brakes may be released by turning the brake valve handle to release position,

,4 in Which, as shown in 3, the straight I g and a brat-re valve.

7 closed and car. door is opened, of a brake cylinder pres V I fling to :the pre air pipe 25 as well as pipe 17 is connected to exhaust port 32 through cavity 33,'so that, the maintaining valve deviceis cutout of action by therclease ofrfiuid pressure from chamber 16;-

y, Having now vdescribed uiy invention, what Iclairn as newand'clesire to secnr 2e Letters Patent, is

V r l. The combination with a brake cylinder,

} i device'havingportsfor controlhncra car door and a service apphcation position, in which-the car door is held another position in which the sure maintaining device operating accord- 'ssure of fluid supplied to the brake cylinder in the service application position of: thejbrake valve device for main- 7 taining ,fthe' brake; cylinder pressure in the held closed and having a diaphragrn with' oneyside constantly connected to the brake cylinder and the other side connected to the brake. cylinder only in the service position of the door-open position of the brake valve del I l V as brake valve and a valve opera-tedby said diaphragm for supplying fluid to the brake cylinder. H p

' 3. The combination with a brake cylinder and a brake. valve de i hdvingr ports f -.11

coi'itrolling the fluid pressure for operating a car door and having'one position in which the brakes are applied and the car near another positionin which the brakes are held applied and the car door is opened, of means for maintaining' the pressure in the brake cylinder inthedoer open position at the'pressure supplied "to tio'nof the brake valve device.

In testirno'ny whereof l have'herennte set y hand. i

owns '0. marine;-

[the brake cylinder in the door closed posh; 

